Kuidas erinevad gorutined niitidest (niitidest)?

Goroutines differ from threads (treads) in the following key aspects:

• Management: Goroutines are managed by the Go runtime, while threads are managed by the operating system. This makes switching between goroutines much easier and faster, as it does not require a kernel context switch.
• Costs: Creating and managing goroutines requires much fewer resources (memory and time) compared to threads. A goroutine starts with a very small stack (a few kilobytes), which can grow or shrink dynamically as needed, whereas threads have a fixed, often much larger stack.
• Scalability: Due to low costs, it is easy to create hundreds of thousands or even millions of goroutines in a single application, while creating the same number of threads quickly exhausts system resources.
• Scheduling: The Go scheduler multiplexes many goroutines onto fewer OS threads. This implements cooperative multitasking among goroutines on a single thread (with elements of preemption), while OS threads are managed by the OS scheduler, which uses preemptive multitasking.

Aspect	Goroutines	Threads (Treads)
Management	Go runtime	Operating system
Costs	Low (memory, time)	High (memory, time)
Scalability	Very high	Limited by system resources
Scheduling	Go scheduler (cooperative)	OS scheduler (preemptive)
Stack	Dynamic, small	Fixed, often large

Example of creating a goroutine:

package main

import (
	"fmt"
	"time"
)

func task(id int) {
	fmt.Printf("Goroutine %d started\n", id)
	time.Sleep(time.Second)
	fmt.Printf("Goroutine %d finished\n", id)
}

func main() {
	go task(1) // Creating a goroutine
	go task(2) // Creating another goroutine

	time.Sleep(2 * time.Second) // Waiting for goroutines to complete
	fmt.Println("Main goroutine finished")
}